Hi!
Didn't try water use with that beast but after all I heard about it: forget it! I asked in my local kite shop (Yes - I trust them! Just bought a Kitesurfer XXL there). Two of the guys have tried it an mentioned it was nearly impossible to relaunch it from water. Even if it's just over kneedeep you have a fair chance for that manoeuver... Though it is a great kite for power use. I'm using it for buggying an for just to have fun

) You have to stear it more by the brake then the front lines. So you should alway have a LITTLE tension on them so that the trailing edge won't flap. The C-Quad is fast and pulls like a truck if you once find out how to fly it. But...I'm doing it for half a year now and it is still difficult for me to have constant power on the handles...
Have fun